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BD8119FM-M
Technical Note
? Soft Start Function
The soft-start (SS) limits the current and slows the rise-time of the output voltage during the start-up, and hence leads to
prevention of the overshoot of the output voltage and the inrush current.
? Self-diagnostic functions
The operating status of the built-in protection circuitry is propagated to FAIL1 and FAIL2 pins (open-drain outputs). FAIL1
becomes low when UVLO, TSD, OVP, or SCP protection is engaged, whereas FAIL2 becomes low when open or short
LED is detected.
FAIL1
OPEN
FAIL2
UVLO
TSD
OVP
OCP
SHORT
MASK
S
R
Q
SCP
Counter
S
Q
EN=Low
UVLO/TSD
EN=Low
R
UVLO/TSD
? Operation of the Protection Circuitry
? Under-Voltage Lock Out (UVLO)
The UVLO shuts down all the circuits other than REG when VCC ? 4.3V (TYP).
? Thermal Shut Down (TSD)
The TSD shuts down all the circuits other than REG when the Tj reaches 175 ℃ (TYP), and releases when the Tj
becomes below 150 ℃ (TYP).
? Over Current Protection (OCP)
The OCP detects the current through the power-FET by monitoring the voltage of the high-side resistor, and activates
when the CS voltage becomes less than VCC-0.6V (TYP).
When the OCP is activated, the external capacitor of the SS pin becomes discharged and the switching operation of the
DCDC turns off.
? Over Voltage Protection (OVP)
The output voltage of the DCDC is detected with the OVP-pin voltage, and the protection activates when the OVP-pin
voltage becomes greater than 2.0V (TYP).
When the OVP is activated, the external capacitor of the SS pin becomes discharged and the switching operation of the
DCDC turns off.
? Short Circuit Protection (SCP)
When the LED-pin voltage becomes less than 0.3V (TYP), the internal counter starts operating and latches off the circuit
approximately after 100ms (when FOSC = 300kHz). If the LED-pin voltage becomes over 0.3V before 100ms, then the
counter resets.
When the LED anode (i.e. DCDC output voltage) is shorted to ground, then the LED current becomes off and the LED-pin
voltage becomes low. Furthermore, the LED current also becomes off when the LED cathode is shorted to ground. Hence
in summary, the SCP works with both cases of the LED anode and the cathode being shorted.
? LED Open Detection
When the LED-pin voltage ? 0.3V (TYP) as well as OVP-pin voltage ? 1.7V (TYP) simultaneously, the device detects as
LED open and latches off that particular channel.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
8/20
2011.08 - Rev.B
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